Low Profile Antenna Performance Study. Part 1. Efficiency and Bandwidth Characteristics
Abstract
The bandwidth and efficiency of antennas whose dimensions do not exceed one-tenth of a wavelength are discussed. A brief review of the Army's present VHF antenna capability is given. The distinction between 'small' and 'low-profile' is made and some basic principles relating to the efficiency and bandwidth of stub and loop antennas are studied. Top-loading and loading elements in the antenna structure (well-known techniques that have been used over the years) are most effective for improving the efficiency and bandwidth of small antennas. It was found that the configuration of the tuning and matching network plays an important role in determining the instantaneous bandwidth of a system. In particular, it is shown that the parallel-input, two-element L- network provides wider bandwidth than does the series input L-network. In addition, it was found that the first element in the L-network, i.e., that nearest the antenna, is the primary source of constraints on the achievable instantaneous bandwidth.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1977
- Accession Number
- ADA040985
Entities
People
- C. M. Desantis
Organizations
- United States Army Communications-Electronics Command